$OpenBSD: patch-tools_lou_compare_c,v 1.1 2016/10/31 16:39:25 ajacoutot Exp $
--- tools/lou_compare.c.orig	Mon Oct 31 17:35:24 2016
+++ tools/lou_compare.c	Mon Oct 31 17:35:48 2016
@@ -4,6 +4,7 @@
 #include "config.h"
 #include <unistd.h>
 #include <fcntl.h>
+#include <sys/stat.h> /* S_IRUSR */
 #include "liblouis.h"
 #include "louis.h"
 
